Compilare: main.cpp: In function 'int main()': main.cpp:72:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (int i = 0; i<ans.size(); i++) { | ~^~~~~~~~~~~ main.cpp:73:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 73 | if (ans[i].size() > nrmax) { | ~~~~~~~~~~~~~~^~~~~~~